Question

这是使用滚动条的颜色选择器。我收到的错误是：使用颜色构造函数在Label上设置setBackground。错误：此类中的构造函数颜色不能应用于给定类型。（int，int，int）除了参数之外没有参数。

import java.awt.*;`
import java.awt.event.*;
public class Color extends Frame implements AdjustmentListener
{
static Label lb1,lred,lgreen,lblue;
static TextField tf1,tf2,tf3;
static Scrollbar sb,sb1,sb2;
static Panel p_main,p1,p2,p3;
static Color c;
public static void main(String args[])
{
    lb1 = new Label("");
    lred = new Label("Red");
    lgreen = new Label("Green");
    lblue = new Label("Blue");
    tf1 = new TextField(20);
    tf2 = new TextField(20);
    tf3 = new TextField(20);
    sb = new Scrollbar(Scrollbar.HORIZONTAL,0,1,0,255);
    sb1 = new Scrollbar(Scrollbar.HORIZONTAL,0,1,0,255);
    sb2 = new Scrollbar(Scrollbar.HORIZONTAL,0,1,0,255);
    c = new Color();
    p_main = new Panel();
    p1 = new Panel();
    p2 = new Panel();
    p3 = new Panel();
    c.setLayout(new GridLayout(4,3));
    p1.setLayout(new GridLayout(1,1));
    p1.add(lb1);
    p2.setLayout(new GridLayout(1,3));
    p2.add(lred);
    p2.add(lgreen);
    p2.add(lblue);
    p3.setLayout(new GridLayout(1,3));
    p3.add(tf1);
    p3.add(tf2);
    p3.add(tf3);
    p_main.setLayout(new GridLayout(3,3));
    p_main.add(p1);
    p_main.add(p2);
    p_main.add(p3);
    c.add(p_main);
    c.add(sb);
    c.add(sb1);
    c.add(sb2);
}
public void adjustmentValueChanged(AdjustmentEvent ae)
{
    int red,green,blue;
    red = sb.getValue();
    green = sb1.getValue();
    blue = sb2.getValue();
    lb1.setBackground(new Color(red,green,blue));
    lred.setBackground(new Color(red,0,0));
    lgreen.setBackground(new Color(0,green,0));
    lblue.setBackground(new Color(0,0,blue));
    Integer ival = new Integer(red);
    String str1 = ival.toString();
    tf1.setText(str1);
    Integer iv = new Integer(green);
    String str2 = iv.toString();
    tf1.setText(str2);
    Integer iva = new Integer(red);
    String str3 = iva.toString();
    tf1.setText(str3);
}
   }

Answer 1

您已经命名了自己的类Color，并且此类中唯一的构造函数是空构造函数，它是由java编译器默认创建的。您必须将自己的类重命名为其他类。然后你可以尝试Swing或awt Color。

使用颜色构造函数在标签上设置背景

1 个答案: